package com.example.shipload_e.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.http.client.CookieStore;
import org.apache.http.cookie.Cookie;

import com.loopj.android.http.SerializableCookie;

import android.content.Context;
import android.content.SharedPreferences;
import android.text.TextUtils;
import android.util.Log;

public class PersistentCookieStore implements CookieStore {
	  private static final String LOG_TAG = "PersistentCookieStore";
	  private static final String COOKIE_PREFS = "CookiePrefsFile";
	  private static final String COOKIE_NAME_STORE = "names";
	  private static final String COOKIE_NAME_PREFIX = "cookie_";
	  private boolean omitNonPersistentCookies = false;

	  private final ConcurrentHashMap<String, Cookie> cookies;
	  private final SharedPreferences cookiePrefs;

	  /**
	   * Construct a persistent cookie store.
	   *
	   * @param context Context to attach cookie store to
	   */
	  public PersistentCookieStore(Context context) {
	    cookiePrefs = context.getSharedPreferences(COOKIE_PREFS, 0);
	    cookies = new ConcurrentHashMap<String, Cookie>();

	    // Load any previously stored cookies into the store
	    String storedCookieNames = cookiePrefs.getString(COOKIE_NAME_STORE, null);
	    if (storedCookieNames != null) {
	      String[] cookieNames = TextUtils.split(storedCookieNames, ",");
	      for (String name : cookieNames) {
	        String encodedCookie = cookiePrefs.getString(COOKIE_NAME_PREFIX + name, null);
	        if (encodedCookie != null) {
	          Cookie decodedCookie = decodeCookie(encodedCookie);
	          if (decodedCookie != null) {
	            cookies.put(name, decodedCookie);
	          }
	        }
	      }

	      // Clear out expired cookies
	      clearExpired(new Date());
	    }
	  }

	  @Override
	  public void addCookie(Cookie cookie) {
	    if (omitNonPersistentCookies && !cookie.isPersistent())
	      return;
	    String name = cookie.getName() + cookie.getDomain();

	    // Save cookie into local store, or remove if expired
	    if (!cookie.isExpired(new Date())) {
	      cookies.put(name, cookie);
	    } else {
	      cookies.remove(name);
	    }

	    // Save cookie into persistent store
	    SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
	    prefsWriter.putString(COOKIE_NAME_STORE, TextUtils.join(",", cookies.keySet()));
	    prefsWriter.putString(COOKIE_NAME_PREFIX + name, encodeCookie(new SerializableCookie(cookie)));
	    prefsWriter.commit();
	  }

	  @Override
	  public void clear() {
	    // Clear cookies from persistent store
	    SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
	    for (String name : cookies.keySet()) {
	      prefsWriter.remove(COOKIE_NAME_PREFIX + name);
	    }
	    prefsWriter.remove(COOKIE_NAME_STORE);
	    prefsWriter.commit();

	    // Clear cookies from local store
	    cookies.clear();
	  }

	  @Override
	  public boolean clearExpired(Date date) {
	    boolean clearedAny = false;
	    SharedPreferences.Editor prefsWriter = cookiePrefs.edit();

	    for (ConcurrentHashMap.Entry<String, Cookie> entry : cookies.entrySet()) {
	      String name = entry.getKey();
	      Cookie cookie = entry.getValue();
	      if (cookie.isExpired(date)) {
	        // Clear cookies from local store
	        cookies.remove(name);

	        // Clear cookies from persistent store
	        prefsWriter.remove(COOKIE_NAME_PREFIX + name);

	        // We've cleared at least one
	        clearedAny = true;
	      }
	    }

	    // Update names in persistent store
	    if (clearedAny) {
	      prefsWriter.putString(COOKIE_NAME_STORE, TextUtils.join(",", cookies.keySet()));
	    }
	    prefsWriter.commit();

	    return clearedAny;
	  }

	  @Override
	  public List<Cookie> getCookies() {
	    return new ArrayList<Cookie>(cookies.values());
	  }

	  /**
	   * Will make PersistentCookieStore instance ignore Cookies, which are non-persistent by
	   * signature (`Cookie.isPersistent`)
	   *
	   * @param omitNonPersistentCookies true if non-persistent cookies should be omited
	   */
	  public void setOmitNonPersistentCookies(boolean omitNonPersistentCookies) {
	    this.omitNonPersistentCookies = omitNonPersistentCookies;
	  }

	  /**
	   * Non-standard helper method, to delete cookie
	   *
	   * @param cookie cookie to be removed
	   */
	  public void deleteCookie(Cookie cookie) {
	    String name = cookie.getName();
	    cookies.remove(name);
	    SharedPreferences.Editor prefsWriter = cookiePrefs.edit();
	    prefsWriter.remove(COOKIE_NAME_PREFIX + name);
	    prefsWriter.commit();
	  }

	  /**
	   * Serializes Cookie object into String
	   *
	   * @param cookie cookie to be encoded, can be null
	   * @return cookie encoded as String
	   */
	  protected String encodeCookie(SerializableCookie cookie) {
	    if (cookie == null)
	      return null;
	    ByteArrayOutputStream os = new ByteArrayOutputStream();
	    try {
	      ObjectOutputStream outputStream = new ObjectOutputStream(os);
	      outputStream.writeObject(cookie);
	    } catch (Exception e) {
	      return null;
	    }

	    return byteArrayToHexString(os.toByteArray());
	  }

	  /**
	   * Returns cookie decoded from cookie string
	   *
	   * @param cookieString string of cookie as returned from http request
	   * @return decoded cookie or null if exception occured
	   */
	  protected Cookie decodeCookie(String cookieString) {
	    byte[] bytes = hexStringToByteArray(cookieString);
	    ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
	    Cookie cookie = null;
	    try {
	      ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
	      cookie = ((SerializableCookie) objectInputStream.readObject()).getCookie();
	    } catch (Exception exception) {
	      Log.d(LOG_TAG, "decodeCookie failed", exception);
	    }

	    return cookie;
	  }

	  /**
	   * Using some super basic byte array <-> hex conversions so we don't have to rely on any
	   * large Base64 libraries. Can be overridden if you like!
	   *
	   * @param bytes byte array to be converted
	   * @return string containing hex values
	   */
	  protected String byteArrayToHexString(byte[] bytes) {
	    StringBuilder sb = new StringBuilder(bytes.length * 2);
	    for (byte element : bytes) {
	      int v = element & 0xff;
	      if (v < 16) {
	        sb.append('0');
	      }
	      sb.append(Integer.toHexString(v));
	    }
		return sb.toString().toUpperCase(Locale.US);
	  }

	  /**
	   * Converts hex values from strings to byte arra
	   *
	   * @param hexString string of hex-encoded values
	   * @return decoded byte array
	   */
	  protected byte[] hexStringToByteArray(String hexString) {
	    int len = hexString.length();
	    byte[] data = new byte[len / 2];
	    for (int i = 0; i < len; i += 2) {
	      data[i / 2] = (byte) ((Character.digit(hexString.charAt(i), 16) << 4) + Character.digit(hexString.charAt(i + 1), 16));
	    }
	    return data;
	  }
	}